Catalytic Converter Set for Nissan Frontier (2005-2019) 2.5L Front & Rear

Direct-Fit Replacement Catalytic Converter Set for 2005-2019 Nissan Frontier (D40)

What it Does: The catalytic converter set replaces the clogged or degraded factory manifold converter and rear secondary unit on the 2005-2019 Nissan Frontier to restore exhaust gas conversion efficiency and eliminate P0420 and P0430 diagnostic trouble codes.

The Stock Nissan Frontier Catalytic Converter Failure

The factory close-coupled exhaust manifold converter on the D40 Frontier equipped with the QR25DE engine experiences severe thermal cycling and sustained exhaust vibration. Over time, the fragile OEM ceramic washcoat degrades and suffers structural matrix fracture or thermal breakdown. This degradation leads to substrate dusting, restrictive carbon clogging, and reduced catalyst efficiency that triggers persistent P0420 DTCs. In severe instances, internal core collapse causes exhaust backpressure spikes that stifle scavenging, degrade fuel economy, and cause erratic idling.

The Engineering Solution

This replacement assembly utilizes a high-temperature 409 stainless steel tubular manifold integrated with a robust 600 CPSI cordierite ceramic substrate. Formulated with a balanced washcoat of palladium and rhodium precious metals, both the integrated manifold converter and the secondary rear converter deliver high-efficiency conversion of hydrocarbons (HC), carbon monoxide (CO), and nitrogen oxides (NOx). CNC-machined thick-gauge flanges ensure a leak-free seal to the cylinder head, while factory-located O2 sensor bungs preserve baseline closed-loop fuel trims without sensor wiring modifications. Mandrel-bent transition tubing minimizes parasitic backpressure to return volumetric efficiency to factory spec.

What's Included

• 1x Front Exhaust Manifold Catalytic Converter
• 1x Rear Underfloor Catalytic Converter
• Installation Mounting Hardware

Technical Specifications

Compatibility

• 2005-2019 Nissan Frontier 2.5L 4-Cylinder (QR25DE)

Frequently Asked Questions & Fitment Warnings

Does this fit the D40 Frontier?

Yes, this is a direct fit for the 2005-2019 Nissan Frontier equipped with the QR25DE 2.5L engine. This set is not compatible with 4.0L V6 models, nor is it legal for sale or use on vehicles registered in California, Colorado, New York, or Maine.

Is cutting or welding required for installation?

No, this direct-fit bolt-on assembly matches factory mounting provisions and uses original exhaust hanger and oxygen sensor locations without fabrication.

The Nissan Frontier Reliability Standard

Engineered to handle sustained utility hauling and daily work duty, this 409 stainless steel dual-converter assembly provides durable federal emissions compliance and restored engine breathing across demanding fleet conditions.